In D2:ED I didn't take out the generator until after I had defeated Xanlosch and Isabelle, so never saw the two summoned opponents. I'll have to try turning into a dragon in DKS when I get that far.
Ha, I got so caught up in the moment I didn't realize I had the names wrong (DUUH) That's what I had done in the past. So I guess, through normal procedure, if you take your dragon form while in combat (before taking out the gen) he will summon the demons anyway.